Rotary piston engine

Abstract

A rotary piston engine having at least two rotary pistons formed as gearwheels mounted in a rotatable fashion on mutually perpendicular axes in a housing that provides a closed seal for the pistons on both faces as well as around their circumferences, is at one point in a sliding, mutually sealing engagement of gear, teeth with each other. The two rotary pistons have different diameters and the teeth forming the individual pistons make contact at an angle of 45° in each case and have slightly helical flanks. The tooth spaces forming a carburetion chamber, a compression chamber and a working chamber have an inside contour precisely matching the shape of the teeth. Each of the internal and external teeth are assigned through-flow bores where each through-flow bores opens into an outlet on a circular surface area of the rotary pistons which lie opposite to each other.

What is claimed is:  
     
       1. A rotary piston engine having at least two rotary pistons, the at least two rotary pistons being formed as gearwheels, mounted in a rotatable fashion on mutually perpendicular axes in a housing, providing a closed seal for the at least two rotary pistons on both faces as well as around the circumferences, and being at one point in a sliding, mutually sealing engagement of gear teeth ( 8 ) with each other, wherein: 
       a) the at least two rotary pistons have different diameters;  
       b) internal teeth and external teeth of the at least two rotary pistons contact at an angle of 45° in each case and have slightly helical flanks;  
       c) tooth spaces, forming a carburetion chamber, a compression chamber, and a working chamber, have an inside contour precisely matching the shape of the teeth;  
       d) each of the internal teeth and external teeth of the at least two rotary pistons is assigned each of throughflow bores,  
       wherein the latter forming a combustion chamber and being incorporated in the rotary piston,  
       wherein said each of the through-flow bores opens into an outlet on the circular surface areas of the at least two rotary pistons which lie opposite to each other,  
       wherein a closed seal being provided through certain angles of rotation for the bore at points opposing to housing walls which enclose one of the at least two rotary pistons in a sandwich arrangement;  
       e) ahead of the point in a sliding, mutually sealing engagement of gear teeth, lies a first connecting duct for each of the at least two rotary pistons in the aforementioned housing walls wherein the first connecting duct provides a flow connection between one of the tooth spaces rotating past the first connecting duct  18  and said each of the throughflow bores and fills the latter with compressed air or a fuel mixture;  
       f) behind the point in a sliding, mutually sealing engagement of gear teeth, lies a second connecting duct for each of the at least two rotary pistons in the aforementioned housing walls wherein the second connecting duct provides a flow connection between the throughflow bores rotating past the second connecting duct and one of the subsequent tooth spaces, into which the charge in said each of the throughflow bores expands;  
       g) the aforementioned housing walls incorporate exhaust openings both before and after the point in a sliding, mutually sealing engagement of gear teeth as well as intake openings lying opposite to the exhaust openings, wherein the intake openings are connected to an air intake or a fuel mixture intake, and wherein the intake openings are flow-connected in sequence to the tooth spaces passing by, and wherein each of the intake openings overlaps each of the opposite-lying exhaust openings for a partial angle of rotation (a).  
     
     
       2. The rotary piston engine according to  claim 1  wherein the intake openings extend across an angular width (b) of more than one tooth space. 
     
     
       3. The rotary piston engine according to  claim 1 , wherein the throughflow bores forming the combustion chambers are coated with a layer of heat insulating material. 
     
     
       4. The rotary piston engine according to  claim 3 , wherein the second connecting ducts is also coated with a layer of heat insulating material. 
     
     
       5. The rotary piston engine according to  claim 1  wherein the throughflow bores forming the combustion chambers are equipped with catalysts or inserts for flameless combustion. 
     
     
       6. The rotary piston engine according to  claim 1  the at least two rotary pistons are each formed as an internal ring gear having a large diameter and enclosing a plurality of the at least two rotary pistons, each being of a smaller diameter and having external toothing, and each being in tooth engagement with the internal ring gear and having their axes of rotation lying in a diametrically symmetrical plane of the internal ring gear, the internal ring gear forming the output of the engine. 
     
     
       7. The rotary piston engine according to  claim 6 , wherein the internal ring gear has external toothing for the transfer of torque to a transmission connected after the engine.